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IS 9377 (1979): Specification for apparatus for aggregateimpact value [CED 2: Cement and Concrete]

IS I9377 - 1979

Indian Standard SPECIFICATION FOR

APPARATUS FOR AGGREGATE IMPACT VALUE

( Second Reprint MARCH 10% )

UDC 620.178.153.2.05:666.972.12

0 Copyright 1980

BUREAU OF INdIAN STANDARDS \...I.. 7 r. . . . . r1.7 nn..*.n*,n nr,... 0.w.n . ..nn MANAh l5IiAVAN. \I BA”A”“I( 3tlAn ,?.A‘-A,‘ IVIAK”

NEW DELHI 110002

Gr 2 April 1980

1s 8 9377 - 1979

Indian Standard SPECIFICATION FOR

APPARATUS FOR AGGREGATE IMPACT VALUE

Cement and Concrete Sectional Committee, BDC 2

Chairman

DR H. C. VXEIVIUWAXAYA

Mbmkrr

R+ruanfing

Cement Research Institute of India, New DcIhi

ADDITIONAL DIRBOTOR, S-AND- Research, Designs 6 Standarda Organization ARDB ( B & S 1 I Ministry of Railwayr 1, Lucknow ----~ - .

DEPUTY D&zcroa, STAND- ’ .-

ARDB ( B & S ) ( Ahil4f6 ) SHRI K. C. AOOARWAL Hindustan Prefab Ltd, New Delhi

SARI C. L. KA~LIWAL ( Alfrr~t~ ) SERI K. P. BANERJEE Larsen & Toubro Ltd, Bombay

SRRI HARISE N. MALANI ( Albrnatr I SERI S. K. BANERJEE SERI R. N. BANEAL

SHRI T. C. CARG ( Altcmalr ) CHIEB ENGINEER ( DESIGNS )

EXEOUTIVE ENQINEER ( DESIGNS ) III ( Allrrnafr )

CHIEF ENQINEER ( PROJEOTS ) DIRECTOR, IPRI ( Al:rrnalr )

DIRECTOR ( CSMRS ) DEPUTY DIREOTOR

( CSMRS ) ( Alternafr ) DR R. K. Gaos~

Natidnal Test Hous:, Calcutta Beas Designr Organization, Nangal Township

Central Public Works Department, New Delhi

Irrigation Department, Government of Punjab

Central Water Commission, New Delhi

Central Road Research Institute ( CSIR ), New Delhi

SHRI Y. R. PHULL ( Alternate I ) SHRI M. DINAKARAN ( Alternate II )

DR R. K. GHOSR Indian Roads Congress, New Delhi

( Continud 4n P4gr 2

@ Coptight 1980

BUREAU OF INDIAN STANDARDS This publication is protected under the Xndion Copyight Act ( XIV of 1957 ) and reproductioh in whole or in part by any means except with written permission of the publisher shall be deemed to be an infringement of copyright under the said Act.

IS : 9377 - 1979

( Continwd from pap

Memhrs

SEBI B. R. GOVIND SFIRI P. C. JAIN

SHBI A. K. Gnprn

‘1

( Alf6mal6 )

Da R. R. HATTIAN~ADI SHBI P. J. JANUS ( Affernafr )

DR IQBAL ALI SBBI S. R. KULKARNI SEBI S. K. LAHA

Engineering Research Laboratories, Hyderabad M. N. Dastur & Co ( Pvt ) Ltd, Calcutta The Institution of Engineers ( India ), Calcutta

SHIU B. T. UNWALLA ( Alfemata 1 DR MOHAN RAI Central Building Research Institute (CSIR ),

Roorkee

R6jwesanting

Engineer-in-Chief’s Branch, Army Headquarters

Hydcrabad Asbestos Cement Products Ltd. Hyderahad

The Associated Cement Companies Ltd, Bombay

DB S. S. REHBI ( Ahrma~e ) SHBI K. K. NAblBIAIt In personal capacity ( ‘Ramanalaya’ II First Crssc~M

DB M. RAMAIAH Paark Rood, ~andirinagar, Adyar, ivicrdrar j

Struct~~~engmeering Research Centre ( CSIR ),

DR N. S. BHAL ( Al&nut6 ) SHBI G. RAMDAS Directorate General of Supplies C Disposals,

New Delhi DE A. V. R. RAO National Buildings Organization, New Delhi

SARI J. SEN Goprn ( Altemato\ Saab R. V. CEALAPATHI RAO Geological Survey of India. Calcutta

SRBI S. ROY ( Alternate ) Srrar T. N. S. RAO Gammon India Ltd, Bombay

SHBI S. R. PINHEIBO ( Alternate ) Soar. AKJUN RIJHBINGHAX’I Cement Corporation of India Ltd, New Delhi

SHBI K. VITHAL RAO ( Altcrnata ) SECRETARY Central Board of Irrigation and Power, New Delhi

DEPUTY SECRETARY ( I ) ( All6r~t6 ) SEBI N. SIVAonRU Roads Wing, Ministry of Shipping and Transport

SHRI R. L. KAPOOB I &6raUf6 ) SHBI K. A, SUBRAB~ANIAM The India Cements Ltd, Madras

SBBI P. S. RAMACHANDBAN ( Altarnuts ! SUPEBINTRNDIN~ E N o I N x B R

( DESIGNS ) Publgad:orks Department, Government of Tamil

EXECUTIVE ENGINEER ( SM & R DIVISION ) ( Aktrnalc )

SHE1 L. SWAROOP Dalmia Cement ( Bharat ) Ltd, New Delhi SARI A. V. RAMANA ( Al~rrnatr )

SEBI B. T. UNWALLA The Concrete Association of India, Bombay &tar Y. K. MEXTA ( A~frmalr )

S~nr D. AJITAA SIMHA. Director General, IS1 ( Er-ojicio Membn ) Director ( Civ Engg )

Secratary

SPRI M. N. NEELAKANDHAN Assistant Director ( Civ Engg ), ISI

( Continurd on pUg6 7 )

2

IS I 9377 - 1979

Indian Standard SPECIFICATION FOR

APPARATUS FOR AGGREGATE IMPACT VALUE

0. FOREWORD

0.1 This Indian Standard was adopted by the Indian Standards Institution on 20 December 1979, after the draft finalized by the Cement and Concrete Sectional Committee had been approved by the Civil Engineering Division Council.

0.2 The Indian Standards Institution has already published a series of standards on methods of testing cement and concrete. It has been recognized that reliable and intercomparable test results could ,be obtained only with standard testing equipment capable of giving the desired level of accuracy. The Sectional Committee has therefore proposed to bring out a series of specifications covering the requirements of equipment used for testing cement and concrete, to encourage their development and manufacture in the country.

0.3 This standard specifies the requirements for the apparatus used for determining the aggregate impact value of coarse aggregate. The aggregate impact value gives a relative measure of the resistance of an aggregate to sudden shock or impact, which in some aggregates differs from its resistance to a slow compressive load. The method of deter- rgit6-$g aggregate impact value has been covered in IS : 2386 ( Part IV )-

.

0.4 In the formulation of this standard, due weightage has been given to international co-ordination among the standards and practices prevailing in different countries in addition to relating it to the practices in the field in this country.

0.5 For the purpose of deciding whether a particular re uirement of this standard is complied with, the final value, observe El or calculated, expressing the result of a teat or analysis, shall be rounded off in accordance with IS : 2-19607. The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard.

l Methodr of test for aggregates for concrete: Part IV Mechanical properties. iRules for rounding off numerical vnlucc ( rroirrd ).

3

IS t 9377 - 1979

1. SCOPE

1.1 This standard covers the requirements of apparatus for determining the impact value of coarse aggregates.

2. APPARATUS

2.1 The apparatus shall consist of an impact testing machine and other accessories ( see 3 and 4 ).

3. IMPACT TESTING MACHINE

3.1 The general form and salient dimensions of machine shall be as described in Fig. 1 and 3.2 to 3.2.2.

NATE- A stroke counter of suitable design may be provided to automatically record the number of blows.

3.2 The total mass of the machine shall be between 45 to 60 kg. The machineshall have a cast iron base weighing between 20 to 30 kg with a plane lower surface of not less than 300 mm diameter, and supported on a plane concrete block of 600 x 600 x 450 mm size. The machine shall be prevented from rocking by securing it firmly and evenly to the foundation. Three 10 mm diameter holes shall be provided in the base plate for this purpose. Alternatively the machine may be supported on a plane metal plate cast into the foundation.

3.2.1 Steel Cub - A cylindrical mild steel cup of the following internal dimensions shall be provided at the centre of the base of the machine in a manner such that it can be easily and rigidly fastened to and removed

L from the base:

Diameter 100 + o’25 mm -0

Depth 50 f 0.25 mm

Thickness 7&lmm

A chamfer of 2 to 3 mm shall be provided at the inner lip of the steel cup. The inner surface of the cup shall be case hardened and shall have a hardness of not less than 650 VH or equivalent.

3.2.2 Steel Hammer - A steel tup or hammer, the lower end of which shall be cylindrical in shape with 2 to 3 mm chamfer at the lower edge. The hammer shall slide freely between the vertical steel guides so arranged that cylindrical lower end of the hammer is above and concentric with steel cup. Arrangement shall be provided for lifting the hammer and allowing it to fall freely between the vertical guides for a height of 380 f 5 mm on the test sample in the cup. It shall be possible to adjust height of fall within 5 mm. Arrangement shall also be provided for locking the hammer while fastening or removing the cup.

4

IS a 9377.1979

The release mechanism for hammer shall be quick release type giving reproducible height of drop between successive drops within f O-5 mm. The mass of the hammer and other dimensions shall be as below:

Mass of hammer 13-75 f 0.25 kg

Diameter of cylindrical lower end of hammer

98+‘rnrn -1

Length of the cylindrical 5Orf lmm lower end

Diameter of shank of 75flmm hammer

The lower surface of the hammer shall be case hardened and shall have a hardness not less than 650 VH or equivalent.

4. ACCESSORIES

4.1 Cylindrical Measures - A cylindrical steel measure tared to the nearest gram, of sufficient rigidity to retain its form under rough usage, and of the following dimensions:

Diameter 75& Imm

Depth 50flmm

Shell .thickness, Min Smm

4.2 Tamping Rod - A straight steel tamping rod of IO mm diameter, 230 mm long and rounded at one end.

5. MARKING

5.1 The following information shall be clearly and indelibly marked on each component of the apparatus in a way that it does not interfere with the performance of the apparatus:

a) Name of the manufacturer or his registered trade-mark or both, and

b) Date of manufacture.

5.1.1 The apparatus may also be marked with the ISI Certification Mark.

NOTE - The use of the ISI Certification Mark is governed by the provisions of the Indian Standards Institution ( Certification Marks ) Act and the Rules and Regulations made thereunder. The IS1 Mark on products covered by an Indian Standard conveys the assurance that they have been produced to comply with the requirements of &at standard under a well-defined system, of ins

8” ction, testing and

quality control which is devised and supervised by ISI an operated by the producer. IS1 marked products are also continuously checked by IS1 for conformity to that standard as a further safeguard. Details of conditions under which a licence for the use of the IS1 Certification Mark may be

ff anted to manufacturen or

processors, mav he obtained from the Indian Standards nrtitution.

5

Is : 9377 l 1979

LOCKING PIN FOR MECHANISM

RELEASECLAW-//

38025

ADJUSTABLE STOP FOR RELEASE

LIF WlG HANDLE

\-STROKE COUNTER (OPTIONAL)

2 OR 3mrtt CHAMFER

CIRCULAR BASE

All dimenrionr in millimetres.

Fro. I AOOREOATB IMPACT TEST MACHINE

6

IS : 9377 - 1979

I P”nt;...,,,l f-r,... *nsr 9 \ \ ““3 . . . . SUrY , # “I,. ,,c.~’ & ,

Instruments for Cement and Concrete Testing Subcommittee, BDC2: 10

Representing

DR IQRAL ALI Engineering Research Laboratories, Hyderabad

Members

PROF R. M. AHUJA Indian Institute of Technology, New Delhi SRRI T, P: EKAMBARAM Highways Research Station, Madras DR R. K. Grrosrt Central Road Research Institute (CSIR),

New Delhi SRRI K. L. S&THI ( A~fcfnatc)

SHRI H. K. GUEA All India Instruments Manufacturers and Dealers Association, Bombay

SHRI V. K. VASUDEVAN ( Alternate ) SHRI P. J. JAQUS

SHRI D. A. WADIA ( Alternate ) The Associated Cement Companies Ltd, Bombay

SHRI M. R. JOSHI Research & Development Organization ( Ministry of Defence ), Pune

SRRI Y. P. PATEAK ( Alternatr ) SRRI E. K. RAMACHAND~AN National Test House, Calcutta _ . PHOF C. K. RAMESI~ Indian institute of Technology, Bombay

DR R. S. AYYAR ( Alternate ) &RI M. V. RANQA RAO Cement Research Institute of Tndia, New Delhi

DR K. C. NARAN~ ( Alternate ) DR S. S. REHSI Cent~~ork~.tilding Research Institute -( CSIR ),

SRRI J. P. KATJ~WICUI ( Alternate 1 SHRI hf. M. D. SETH Publ$radys;ks Department, Government of Uttar

SHRI J. P. BHATNAQAR ( Alternate ) SHRI H. C. VERMA Associated Instrument Manufacturers ( India )

Private Ltd, New Delhi SERI A. V. SHASTRX ( Aftematr )

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